Hever
energy conversion device



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.0. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber or pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The tiles 0!these applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofllce makes no assertion as tothe novelty or the disclosed subject matter.

PUBLISHED JULY 28, 1970 A secondary battery is made by using acationically conductive ceramic separator to separate a molten alkalimetal anode from a cathode compartment containing a metallic material ina non-aqueous solvent. Useful alkali metals include sodium, potassium,etc., and compositions useful in the cathode compartment include copperchloride, copper sulfide, nickel fluoride, etc., dissolved in solventssuch as dimethylsulphoxide N-dimethyl formamide, propylene carbonate,etc. Other salts can be added to the electrolyte to increase itsconductivity. Cations of the alkali metal pass through the separatoreasily but the separator blocks passage of the materials and anions inthe cathode compartment. Graphite felt can be used in the cathodecompartment as an energy collector. Useful separator materials includethose disclosed in US. Pat. 3,404,- 036. The battery has an extremelyhigh theoretical energy density and exhibits excellent charge andrecharge capability.

July 28, 1970 K. o. HEVER ENERGY CONVERSION DEVICE Filed Nov. 14, 1969 SWWW 2 m w.? w IOfiA mi 0 K

